Grammy-winning rapper Kanye West reportedly blanked out during his performance at mother-in-law Kris Jenner‘s 60th birthday last week.

According to reports, Kanye forgot the lyrics to his own song during Jenner’s celebration.

The 38-year-old rapper was passed the mic by singer Charlie Wilson, who was singing his tune ‘Outstanding’ before breaking into Kanye’s ‘See Me Now’ – on which he performed with Beyonce – but he admitted he could no longer remember the lyrics of the 2010 single, and quickly improvised with one of his rival’s tracks instead. A source said: “Kanye said, ‘I don’t remember the words!’. So he started singing 50 Cent’s ‘In Da Club’ instead. The whole crowd was chanting [the song’s lyrics], ‘Go Shorty! It’s your birthday!'” (AZ Central)

Find out who else showed Kris Jenner some birthday love on the next page…

Footage of Yeezy singing “Happy Birthday” at the star-studded celebration has surfaced.

#PressPlay : #KanyeWest singing #HappyBirthday to #KrisJenner at her 60th Bday party! #CharlieWilson

A post shared by The Shade Room (@theshaderoom) on

Jenner’s daughter Kylie and her hip-hop boyfriend Tyga came through for her big night.

Kendall Jenner, 20, dressed up true to the theme as Gatsby’s love interest Daisy Buchanan, wearing a silver sequined mini-dress with matching headband and a blonde wig with vintage 1920s style waves. Sister Kylie, 18, went way more futuristic in a gorgeous silver gown with beads all over it. Her boyfriend Tyga, 25, kept is super classy in a white tuxedo jacket and black pants, and the couple made sure to pose elegantly for a photo in front of a Rolls Royce which the social media queen shared on her Instagram account. (Hollywood Life)

Kylie posted up pictures from the outing on Instagram.

A post shared by Kylie (@kyliejenner) on

outfit change

A post shared by Kylie (@kyliejenner) on

my date

A post shared by Kylie (@kyliejenner) on

hello 1920

A post shared by Kylie (@kyliejenner) on

Kanye’s wife Kim Kardashian West gave Kris a birthday shout-out on Instagram heading into last weekend.